*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body{
    background:url(../images/bg.jpg);
    
}
header{
    height: 100px;
    background: url(../images/head_bg.png);
    background-size:100% 100%;
    position: relative;
    h1{
        font-size: 38px;
        text-align: center;
        line-height: 80px;
        color: #fff;
    }
    ul{
        display: flex;
        position: absolute;
        top: 0;
        height: 80px;
        color: #fff;
        line-height: 60px;
    }
    li{
        
        list-style: none;
    }
}
.mainbox{
    min-width:1024px;
    max-width: 1920px;
    height: 800px;
    margin: 0 auto;
    display: flex;
    position: relative;
    .main1{
        margin: 10px 10px ;
    .box1{
        background: url(../images/line\(1\).png) rgba(1, 39, 210, 0.1);
        height: 380px;
        width: auto;
        margin-bottom: 30px;
    }
    .box2{
        background: url(../images/line\(1\).png) rgba(1, 39, 210, 0.2);
        height: 380px;
        width: auto;
        margin-top: 80px;
    }
    }
    .main3{
        margin: 10px 10px ;
        position: relative;
    .box1{
        background-color: lightblue;
        height: 380px;
        width: auto;
        margin-bottom: 30px;
    }
    .box2{
        background-color: lightblue;
        height: 380px;
        width: 600px;
        margin-top: 50px;
        position: absolute;
    }
    }
  
}

.main2 {
    margin: 10px 10px;
}

.main2 .box1 {
    height: 380px;
    width: auto;
    margin-bottom: 30px;
    background: url(../images/line\(1\).png) rgba(255, 255, 255, 0.5);
}

.main2 .box2 {
    height: 380px;
    width: auto;
    background: url(../images/line\(1\).png) rgba(255, 255, 255, 0.5);
    margin-top: 80px;
}
.mainbox > div {
    flex: 1;
}

.mainbox > div:nth-child(1) {
    flex: 3;
    
}

.mainbox > div:nth-child(2) {
    flex: 3;
    
}

.mainbox > div:nth-child(3) {
    flex: 3;
   
}
.alltitle{
    font-size: 20px;
    text-align: center;
    line-height: 30px;
    color: blue;
    
}

.allnav{
    width: auto;
    height: 340px;
    text-align: center;
}


